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When you're so messed up in the head about something you can't even pick the right suffix to make it sound fancy.
'I'm obsessivingly confused about this spelling, I've been staring at it for 10 hours.'
'Why is it obsessivingly hard to pick between -ly and -ing? I'm losing my mind.'
'I'm obsessivingly stuck between two suffixes, and I'm gonna scream if I have to pick one more time.'